Wheelchair

ABSTRACT

The wheel comprises a rim member  20 , a hub member  22  which is connected to the center of the rim member via the wheel  21  and rotatably connected to a chair part  1 . The wheel  2  fixes a cushion ring  26  on the outer periphery of the rim member  20 , and has a continuous wall portion  31  on outside of the outer periphery. This continuous wall portion  31  is shaped in ring form along the rim member  20 , and provides a grip ring  27  on the edge portion. The wheelchair forms a finger-holding cavity  32  by the continuous wall portion  31.

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a wheelchair with a chair part and wheels provide on the both side of the chair part, allowing a user who sits on the chair moving himself by rotating the wheels using his own hands.

[0002] Currently used wheelchair has a wheel which fixes a hub via a spoke on a rim fixing a tire around thereon, and a metal ring is fixed on the outer side of the rim. The metal ring has smaller diameter than the tire, and spaced apart from the rim to easily grasp to drive the wheel. To separate a metal ring from a rim, the metal ring fixes an arm in a predetermined space to fix a rim.

[0003] In use of the wheelchair with this construction, a user grasps a metal ring and rotates the wheel. But his hand hits the arm with a pain uncomfortably. To prevent his hand from hitting the arm while driving the wheel, it is necessary for user to keep his hand off from the metal ring after he rotates the wheel grasping the metal ring. It is impossible to drive the wheel keeping his hand on or around the metal ring.

[0004] To prevent this drawback, another wheelchair was developed. In which an disk is fixed on the outside of the wheel (see patent reference 1). The wheelchair disclosed in this reference has a disk 41 fixed on outside of the wheel 40, and a protruding portion 42 is provided on an outer periphery of the disk 41 to grip by hand.

[0005] [patent reference 1] Japanese Patent Laid-Open No. 11-347072

[0006] The wheel 40 for wheelchair shown in FIG. 1 is used to drive the wheel 40 by hand grasping the protruding portion 42 of the disk 41 fixed outward of the wheel 40. Since this wheel 40 with this structure has such drawbacks that it easily slips since the protruding portion 42 on the wheel 40 is griped both upper side and lower side by hand, further, if a user grips hard to prevent from slipping, then his hand gets fatigued easily. Moreover, the wheel 40 with such construction has the disk 41 fixed to the rim 43 and the protruding portion 42 protrudes from this disk 41 outward. This configuration causes thicker size of the whole wheel, and it would be hard to move in the small room smoothly because of the wide side. Also, another wheelchair in the related art having a wheel with metal ring has similar drawbacks, i.e., its metal ring protrudes outwardly, resulting in wider size of the wheel and thereby it would also be hard to smoothly move in the small room.

[0007] The present invention is developed for the purpose of solving such drawbacks. An important object of the present invention is to provide a wheelchair which comfortably drives wheels preventing user's hand form hurting, and easily drives wheels allowing light griping without slip. Another important object of the present invention is to provide a wheelchair with smaller width of the wheel, achieving easy and smooth move even in the smaller room. Further important object of the present invention is to provide a wheelchair which has simple structure, resulting in good for mass production with lower costs.

[0008] The above and further objects and features of the invention will more fully be apparent from the following detailed description with accompanying drawings.

SUMMARY OF THE INVENTION

[0009] The wheelchair of the present invention drives wheels for movement rotating by hand of a user who sits on a chair part. The wheel comprises a rim member, a hub member which is connected to the center of the rim member via wheel and rotatably connected to a chair part. The wheel fixes a cushion ring on the outer periphery of the rim member, and has a continuous wall portion on outside of the outer periphery. This continuous wall portion is shaped in ring form along the rim member, and provides a grip ring on the edge portion. The wheel chair defines finger-holding cavity for which user inserts his finger into the finger-holding cavity and grips grip ring then rotates the wheel.

[0010] The wheelchair with this construction has an advantageous effect that a user uses it comfortably without any hurt of his hand when rotating the wheel, and easily drives the wheels without slip by holding lightly. This is because that this wheelchair has unique configuration which provides grip ring on the rim member of the wheel to drive the wheel by holding the grip ring. The wheelchair with this configuration has the continuous wall portion on the outside of the outer periphery of the wheel. This continuous wall portion is shaped in ring shape along the rim member. The grip ring is provided on its edge portion. By employing this configuration, it is not necessary to provide partially connecting arms like conventional wheelchair. Because the grip ring is connected to the wheel via continuous wall portion, even if connecting member which connect the grip ring with the wheel hits a user's hand, it does not hurt thereby comfortably usable. Further, according to the wheelchair with this configuration, a continuous wall portion forms finger-holding cavity is formed by the continuous wall portion having the grip ring on the edge portion. Since a user can insert his finger into the inside of the finger-holding cavity, he can hold the grip ring ashy, lightly, but even firmly, and it is easy to drive the wheel.

[0011] Further, the wheelchair of the present invention preferably has a rim member of the wheel in U shape of radially cut cross sectional form. This rim member has a configuration which connects inner sidewall locating the chair side with the opposing outer sidewall via a connecting ring. The outer sidewall forms a continuous wall portion. The rim member fixes a cushion ring on outer side of the connecting ring. Also it connects inner sidewall with a wheel portion and provides the grip ring on the edge of the outer sidewall. A U-shaped part comprising inner sidewall, connecting ring and outer sidewall forms finger-holding cavity.

[0012] Because this wheelchair has the rim member of the outer periphery of the wheel formed in U-shape of the cross sectional form by connecting the inner: sidewall located in the chair side with the opposing outer sidewall via connecting ring, unlike conventional wheelchair, it avoids wider wheel having such as a disk outside of the wheel, i.e., the invention achieves small width of the wheel allowing smooth movement even in a small room. Further, this wheelchair employs configuration for grip ring to be easily and lightly gripped by inserting user's finger into the inside of the U-shaped portion which is formed by the inner sidewall, outer sidewall and connecting ring, resulting in easy drive of the wheel.

[0013] The wheelchair of the present invention can form smooth surface of the inside of the U shaped part comprising the inner sidewall, outer sidewall and connecting ring, without pits or projections which touch user's hand nor gap along its rotation direction. Since this wheelchair removes stumbling objects such as pits, projections or gap from area which a user may touch his hand when in use, so even if user's hand touched this area, there is no troublesome object which may hurt the hand, thus comfortable use is realized.

[0014] In addition, the wheelchair can form smooth plate inside of the U-shaped part integrally. Further more, the wheelchair may form the rim member comprising the inner sidewall, outer sidewall, and connecting ring made by plastic. This wheelchair integrally forms the rim member made by plastic, achieving simple configuration and capable of mass production at lower cost.

[0015] The wheelchair may employ the configuration in which a rim member of a wheel comprises a ring part fixing a cushion ring on the outer periphery and a continuous wall portion provided on outer side of the ring part, thereby a finger-holding cavity may be formed by the continuous wall portion and ring part.

[0016] Furthermore, the wheelchair may employ the configuration of the outer side of the ring part and surface of the continuous wall portion as a surface having no pits, rojections or gap those of which may interfere a user's hand in a direction of rotation. Since this wheelchair makes the area at which user's hand may touch something as the area which no pits, projection nor gap might touch user's hand, even if user touched this area, he could not troubled by hurting his hand, resulting in comfortable use.

[0017] Still, the wheelchair makes the ring part and a continuous wall portion molded integrally by a plastic to make the wheel simple structure. Because this wheelchair integrally forms the ring part and continuous wall portion by plastic, it is easy and less expensive to produce the wheel.

[0018] The wheelchair may curve or angled the continuous wall portion against the center of the wheel and provide the grip ring to the center side from the outer periphery of the rim member to locate the grip ring on the edge by elongating the continuous wail portion without enlarging the width of the wheel. Such configuration with longer continuous wall portion and grip ring located on the edge allows finger-holding cavity deeper to grip the grip ring firmly and easily.

[0019] The wheelchair with the continuous wall portion which the maximum thickness (D) of the grip ring larger than the minimum thickness (d) of a connecting portion of the outer periphery of the wheel and grip ring allows firm gripping of the grip ring.

[0020] The wheelchair can mold the rim member except the cushion ring and wheel part and hub member in a plastic uniformly. The cushion ring can also be formed a rubber ring. Still further, the wheelchair may curve the wheel portion from rim member to hub member to make the width of the whole wheel narrow.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021]FIG. 1 is a sectional view of the wheel of the related art wheelchair;

[0022]FIG. 2 is a side-view of the wheelchair according to one embodiment of the invention;

[0023]FIG. 3 is a plan of the wheelchair shown in FIG. 2;

[0024]FIG. 4 is a rear view of the wheelchair shown in FIG. 2;

[0025]FIG. 5 is a perspective view which shows the wheelchair shown in FIG. 2 is contained in a bag case;

[0026]FIG. 6 is a sectional view of a bag case shown in FIG. 5

[0027]FIG. 7 is a feature enlarged view which shows connecting construction of the first bag case and the second bag case;

[0028]FIG. 8 is a expanded sectional view which shows connecting construction of the wheel with the first bag case;

[0029]FIG. 9 is an expanded sectional view of the wheel of wheelchair shown in FIG. 2;

[0030]FIG. 10 is an expanded sectional view of the wheel rim member shown in FIG. 9;

[0031]FIG. 11 is an expanded sectional view of another example of a where;

[0032]FIG. 12 is an expanded sectional view of the wheel rim member shown in FIG. 11;

[0033]FIG. 13 s an expanded sectional view of another example of a wheel;

[0034]FIG. 14 is an A-A line sectional view of the wheel shown in FIG. 13;

[0035]FIG. 15 is an expanded sectional view of another example of a wheel;

[0036]FIG. 16 is an expanded sectional view of another example of a wheel;

[0037]FIG. 17 is an expanded sectional view of another example of a wheel;

[0038]FIG. 18 is an expanded sectional view of another example of a wheel;

[0039]FIG. 19 is a back perspective view of the wheelchair according to another example of the present invention;

[0040]FIG. 20 is a front perspective view showing the folded wheelchair shown in FIG. 19;

[0041]FIG. 21 is a rear perspective view of the grip of the wheel chair shown in FIG. 19, in which the grip is rotated 180 degrees.

DETAILED DESCRIPTION OF THE PREFFERED EMBODIMENTS OF THE INVENTION

[0042] A wheelchair shown in FIG. 2 to FIG. 4 comprises a chair part 1 on which a user can sit, wheels 2 rotatably attached to the both sides of the chair part 1, and free wheels 3 which is positioned in the front portion of the chair part 1 and is able to change the direction of travel of the wheelchair. The shown wheelchair, as illustrated in FIG. 5, is configured to be folded and housed in bag case 4 to easily carry out. It should be noted that since the present invention is directed to such a whole mechanism of the wheelchair, thus its construction of the whole wheelchair is not limited to those shown in FIGS. The invention can employ any construction such as currently used or future developed structure, for example, a non-foldable wheelchair, or a wheelchair foldable for width only.

[0043] The wheelchair shown in FIGS. employs the chair part 1 as the bag case 4. The bag case 4 comprises a first bag case 4A serving as a seat base and a second bag case 4B serving as a backrest. The first bag case 4A and the second bag case 45 provide sidewall around a rectangular bottom plate. The first bag case 4A and the second bag case 4B are connected each other and mounts necessary parts such as the wheels 2 and free wheel 3 inside, respectively, as shown in FIG. 5 and FIG. 6. To store necessary parts, the first bag case 4A and the second bag case 4B detachably connected detachable connector (not illustrated) at the opening edge of the peripheral walls. The detachable connector can be a mounting fitting used for connecting bag detachably. When using as a chair, the first bag case 4A and the second bag case 4B are opened to take out parts such as the wheels 2 and free wheel 3, and the first bag case 4A and the second bag case 4B are connected to have an angle slightly larger than the right angle to the bottom plate. In order to achieve such a connection, the bottom plate provides a detachable connector 5.

[0044] This detachable connector 5 comprises an arm 5A fixed to the bottom plate, a connecting shaft 5B which penetrates and passes through the arm 5A as shown in of enlarged view of FIG. 7. The arm 5A forms a through-hole to pass the connecting shaft 5B through. The first bag case 4A and the second bag case 4B are connected by the connecting shaft 5B passing through this through-hole. The first bag case 4A and the second bag case 4B connect an arch-shaped elbow rest 6 at the both sides. The elbow rest 6 is expandable and it has a stopper (not illustrated In FIGS.) that can hold it at a desired length in expandable and/or contractable position. The elbow rest 6 is connected to the both ends of the first bag case 4A and the second bag case 4B to connect the first bag case 4A and the second bag case 41 with a predetermined angle.

[0045] Further, the bag case 4 shown in FIGS. provides a movable wheel 7 on the first bag case 4A and the second bag case 4B to be movable it in a standing position retaining parts inside. The movable wheel 7 is free wheel movable in any direction of travel. Also, it has a telescopic motion handle 8 retracted from the bag case 4 in standing position.

[0046] The first bag case 4A connects the free wheel 3 in foldable fashion. This free wheel 3 is housed in the first bag case 4A as shown in FIG. 6. When wheelchair is used, as shown in FIG. 2, the free wheel 3 is taken out from the first bag case 4A, and it is stopped by stopper (not illustrated in FIGS.) in a perpendicular position to the bottom plate of the first bag case 4A. Further, the wheelchair shown in FIGS. provides a footrest 9 on the first bag case 4A. The footrest can be extended and contracted so as to be extended to the position where a user can put his foot thereon when in use. The footrest 9 connects a string 10 on the edge portion and the string 10 is connected to the first case bag 4A so as to hold a predetermined angle by the string.

[0047] The wheel 2 is detachably mounted on both sides of the first bag case 4A. The wheel 2 is detachably connected to an axle 11 of the first bag case 4A. The first bag case 4A detachably connects the axle 11 coupling the wheel 2 as shown in a sectional view of FIG. 8. The axle 11 provides male screw in a nose. A nut 12 connects the axle 11 by screwing the male screw, and it is fixed inside of the first bag case 4A. Further, the first bag case 4A forms a through-hole 13 on the sidewall for axle 11 be penetrating through. The axle 11 is housed in the first case bag 4A by screwed into the nut 12, or and taken off there.

[0048] As shown in FIG. 9, the wheel 2 comprises rim member 20 on outer periphery, a hub member 22 which rotatably connects at the axle 11 of chair part 1 which connects at the center of the rim member 20 via wheel part 21. As shown in FIG. 10, the wheel 2 comprises continuous wall portion 31 in outer periphery of the outer periphery portion. The rim member 20 shown in a cross-sectional view of FIG. 9 and FIG. 10 is shaped in U-shaped form in cross section form cut in the radial direction. This U-shape is to connect the inner sidewall 23 positioned in the chair side with the outer sidewall 24 on its opposing side via the connecting ring 25. This rim member 20 forms the continuous wall portion 31 by the outer sidewall 24. The rim member 20 fixes a cushion ring 26 serves as a tire on the outer periphery in order to move smoothly even on the road with pits and/or projections. Although the cushion ring 26 shown in FIGS. is a rubber ring, it should be noted that a cushion ring can be a tire in which an air is filled. The cushion ring 26 is fixed on the outer periphery of the connecting ring 25 using adhesives. It should be noted that another configuration may also be applicable for connecting cushion ring like known wheel of a wheelchair, such as providing grooves on the outer periphery surface of the connecting ring and putting a cushion ring on there by adhesives along the grooves. The rim member 20 connects the inner sidewall 23 with the wheel part 21, and grip ring 27 is provided on the edge of the outer sidewall 24. This rim member 20 forms a finger-holding cavity 32 by the outer sidewall 24, i.e., the a finger-holding cavity 32 is formed by U-shaped part 28 composing the inner sidewall 23, connecting ring 25 and outer sidewall 24. By inserting user's finger into the inside of the finger-holding cavity 32 thereby gripping the grip ring 27 by his hand, the wheel 2 can be rotated and the wheelchair moves back and forth.

[0049] The wheel 2 forms its surface area as clean, which means “substantially no obstacle such as pits, projections or gaps which may interfere or touch user's hand,” at the inner surface of the U-shaped part 28 composing the outer sidewall 24, connecting ring 25 and inner sidewall 23 along the radial direction. The wheel 2 shown in FIGS. achieves such a smooth surface without pits, projections nor gaps touching user's hand by integrally forming a smooth plate on the inner sidewall 23 where inner surface of the U-shaped part 28. The wheel 2 with this configuration can be smoothly rotate by holding the grip ring 27. Further, the wheel 2 with this configuration does not employ conventional structure such as the driving ring which drives the wheel is fixed on the wheel using an arm, rather it employs an surface without pits, projections or gaps on inner surface of the U-shaped part 28, therefore, when rotating the wheel 2 by holding the grip ring 27, there is no obstacle which might interfere or touch operator's hand, preventing the hand from hurting effectively. It should be noted that the wheelchair of the present invention may provide a miner irregularities such as pits or projections, even gaps on the inside of the U-shaped part. Th rim member 20 comprising the inn r side wall 23, outer sidewall 24 and flat plat 29 may be integrally formed in a plastic.

[0050] The wheel 2 shown in FIGS. molds the rim member 20 except the cushion ring 26, and wheel part 21 and hub member 22 in one piece made by plastic. In the wheel 2 shown in FIGS., the wheel part 21 is a radial rod connecting the edge portion of the hub member 22 and rim member 20. The wheel part 21 may be formed in a planner shape as a whole. Further, the wheel can employ another form such as the rim member comprising the inner side wall, outer sidewall, connecting ring and smooth plate is integrally formed by plastic, and it is connected to the hub member via wheel part, which is separate member from the rim member.

[0051] The wheel 2 shown in FIGS. employs the edge portion of the grip ring 27 of the outer sidewall 24 of the rim member 20 curving inwardly, and the grip ring 27 provided on the open end of the U-shaped part 28. In the rim member 20 with this construction, the wheel 2 can be rotated by inserting operator's finger into an aperture deeply to firmly grip the finger-holding cavity 27. It should be noted that the rim member of the wheel can also employ the grip ring 1127 be in a position extending in a vertical direction as shown in FIG. 11 and FIG. 12. In these FIGS., the same component as explained in the above are assigned as the same number of the last two digit of the above described example.

[0052] Furthermore, the wheelchair of the present invention can employ the wheel construction in the following. Here, the same rule is applied as the above, i.e., in the following examples, the same component as above-mentioned example is labeled as the same legend and same two digit of the reference number are assigned as the above-mentioned example, and detailed explanation is omitted.

[0053] The rim member 1320 of the wheel 132 shown in FIG. 13 comprises ring member 1330 connected with the wheel part 1321 and continuous wall portion 1331 arranged on the outside face of this ring member 1330. In this rim member 1320, the cushion ring 1326 is fixed to the outer periphery of the ring member 1330, and the grip ring 1327 is provided on the edge of the continuous wall portion 1331. As shown in a sectional view of FIG. 14, the continuous wall portion 1331 is in ring form consecutive in rotating direction of the wheel 132, and this ring shape is along the outer periphery of the ring 1330. As shown in FIG. 13, the continuous wall portion 1331 protrudes outwardly from the outside surface of the ring member 1330, and the grip ring 1327 provided on the edge portion is arranged in distant location away from the ring member 1330. The continuous wall portion 1331 protruding from the ring member 1330 is designed that the width (W) in this part is smaller than width (L) of the hub member 1322 of the wheel 132, or alternatively substantially equal. It should be noted that the width in a continuous wall portion (W) may be larger than the width (L) of a hub member of wheel to some extent.

[0054] As shown in FIG. 13, the rim member 1320 with the continuous wall portion 1331 and ring member 30 form the finger-holding cavity. The finger holding cavity is the reentrant positioned between the ring member 1330 and grip ring 1327, opening to the inner side of the rim member 1320. In this wheel, an operator can insert his finger into the inside of the finger-holding cavity to grip the grip ring 1327 by his hand. Further, the rim member 1320 employs the surface area where the surface of the continuous wall portion 1331 and outer surface of the ring part 1330 as no pits, projections or gaps which may bar or contact the operator's hand along the rotating direction of the wheel 132. It should be noted, as for the continuous wall portion and the ring member, minor pits and projections which do not hurt the operator's hand even if they touched, or other gaps may be provided on their surfaces.

[0055] Further, the continuous wall portion 1331 shown in FIGS. has maximum thickness (D) of the grip ring 1327 larger than the minimum thickness (d) of the connecting portion 1333 of the grip ring 1327 with the ring member 1330. It should be noted, in this specification, the maximum thickness (D) of the grip ring and the minimum thickness (d) of a connecting portion mean thickness in perpendicular direction against the projecting direction of the continuous wall portion 1331 as shown in FIG. 13. Therefore, “making the maximum thickness of a grip ring (D) larger than the minimum thickness (d) of a connecting portion” means that providing a portion at least thinner than the grip ring in the intermediate of the connecting portion. By employing the rim member 1320 with this configuration, it allows firm griping applying light force of grip ring 1327 by gripping thinner portion of the connecting portion 1333 while inserting finger into the finger-holding cavity 1332. The continuous wall portion 1331 has maximum thickness of a grip ring (D) more than one time, preferably 1.2-10 times, more preferably 2-5 times larger than the minimum thickness (d) of a connecting portion 1333 to easily grip the grip ring. Further, the continuous wall portion 1331 shown in FIG. 13 forms a grip cavity 1334 on the opposing side of the finger-holding cavity 1332, i.e., where outer periphery side of the rim member 1320, and interface of the grip ring 1327 and connecting portion 1333. This continuous wall portion 1331 allows easy gripping of the grip ring 1327 in catching hold both of the finger-holding cavity 1332 and grip cavity 1334. The continuous wall portion 1331 shown in FIG. 13 employs circular shape of the cross-section of the grip ring 1327. It should be noted that the grip ring may also employ various shape which would not hurt operator's hand even if the hand touched, such as oval, ellipse, or other configuration having curving portion.

[0056] Further, the rim member 1320 shown in FIG. 13 employs planar connecting portion 1333, and makes continuous wall portion 1331 slant toward the center direction of the wheel 132. This construction has advantageous effect by making the finger-holding cavity 1332 deeper so that finger insertion into there would be easier. The continuous wall portion 1331 makes the finger-holding cavity 1332 deeper ideally by making the angle of dip a for radial direction of the wheel 132 an acute angle. The angle of dip a of continuous wall portion 1331 can be 30-80 degrees, for example, preferably 45-70 degrees. It should be noted that the angle of dip a of continuous wall portion is not necessarily an acute angle, and it may be more than 90 degrees. For example, the rim member 1520 of the wheel 152 shown in FIG. 15 employs about 90 degrees of angle of dip a for the continuous wall portion 1531. The continuous wall region 1531 shown in this FIG. has the maximum thickness (D) of the grip ring 1627 more than 3 times larger than the thickness of connecting portion 1533, and the grip cavity 1532 is formed by projecting the edge portion of the grip ring 1527 into the center direction of the wheel 152. Although not illustrated, the continuous wall portion can make the finger-holding cavity much deeper by enlarging the maximum thickness (D) of the grip ring. By the way, the continuous wall portion 1531 of FIG. 15 also provides the grip cavity 1534 on the opposing side of the finger-holding cavity 1532 so that the grip ring 1527 is easily caught well comfortably.

[0057] Further, the rim member 1320 shown in FIG. 13 and FIG. 15, 1520 is the outer periphery of the ring member 1330 and 1530, and the continuous wall portion 1331 and 1531 are provided in spaced-apart position to the center side to some extent from the outer periphery edge. Because the rim member 1320 and 1520 shown in these FIGS. are formed in a curved shape at the cross-section of the their outer side toward the chair part 1, the finger-holding cavity 1322 and 1532 are made deepen without enlarging the width (W) of the wheel 132 and 152, by means of providing the continuous wall portion 1331, 1531 in spaced-apart position to the center side to some extent from the outer periphery. It should be noted that the continuous wall portion may be provided in the outer periphery edge of the ring member. The configuration of providing the continuous wall portion and angled toward the inner periphery achieves deeper finger-holding cavity by elongating the continuous wall portion and providing the grip ring on the edge, without enlarging the width of the wheel.

[0058] Further, the rim member 1620 of the wheel 162 shown in FIG. 16 curves the continuous wall portion 1631 toward the center direction of the wheel 162. The continuous wall portion 1631 shown in FIG. curves the connecting portion 1633 toward the wheel 162 and provides the grip ring 1627 on the edge portion. The rim member 1620 with this construction deepens the grip cavity 1632 by curving the continuous wall portion 1631. As described above, such configuration of curving the continuous wall portion 1631 allows deeper finger-holding cavity 1632 by longating the continuous wall portion 1631 without largely protruding the grip ring 1627 outwardly, i.e., without enlarging the width (W) of the wheel 162. This construction can achieve firm gripping of grip ring 1627 well comfortably.

[0059] Further, the wheel 2 shown in FIG. 9 to FIG. 12 has the wheel part 21 curving shape from inside close to the chair part 1 to outside, from the rim member 20 to the hub member 22, i.e., form the outer region to the center. This wheel 2 has an advantageous effect of narrowing the whole width while making its shape easy to grasp of the grip ring 27. Accordingly, the wheelchair which width of wheel 2 is narrow can also shrink the whole wheelchair width, thus it achieves extremely functional movement even in a smaller location such as a vehicle or a lavatory.

[0060] Further, the wheel can employ the construction shown in FIG. 17 and FIG. 18. The wheel 172 shown in these FIGS. uses the wheel part 172, 182 in radial rods, and connects the hub member 1722, 1822 with the rim member 1720, 1820 via these plural rods. The radial rods composing the wheel part 1721, 1821 is disposed alternately on the outside and insides (left and right in FIGS.) of the wheel 172, 182 at even spaces, the same structure as a wheel of bicycle. The wheels with this configuration is fabricated using the hub member 1722, 1822, the wheel part 1721, 1821 and the rim member 1720, 1820, all of the parts are made by metal, or partially made by metal parts and others made by plastic. Further, the wheel 172, 182 forms groove 1736, 1836 on the outer periphery of the rim member 1720, 1820 and puts cushion ring 1726, 1826 on the groove 1736, 1836 to connect them preventing dislodging. This cushion ring 1726, 1826 can be a tire of tube type.

[0061] Further, the wheel 172, 182 shown in these FIGS. provide the continuous wall portion 1731, 1831 on the outside of the outer periphery, and these continuous wall portion 1731, 1831 form the finger-holding cavity 1732, 1832. The wheel 172 shown in FIG. 17 provides the continuous wall portion 1731 at the interface between the wheel part 1721 and rim member 1720. The wheel 182 shown in FIG. 18 provides the continuous wall portion 1831 on the outer periphery of the wheel part 1821. Also, a continuous wall portion may be provided in the outside surface of a rim member. The continuous wall portion 1731, 1831 shown in FIGS., are connected with the outside face of the wheel 172, 182, and fixed thereon. In order to connect and fix these wheel 172, 182, the wheel 172, 182 shown in FIGS. fix ring-shaped fixing plate 1735, 1835 on the outer periphery of the wheel part 1721, 1821. The continuous wall portion 1731, 1831 are integrally formed with the fixing plate 1735, 1835, and fixed on the outer periphery of the wheel 172, 182 via the fixing plate 1735, 1835. It should be noted that the continuous wall portion can be fixed by connection with the finding plate, not integrally formed with the fixing plate. The fixing plate 1735, 1835 are connected and fixed with wheel part 1721, 1821 or rim member 1720, 1820 by welding or adhesion. It should be noted that the fixing plate can be connected or fixed by using a connector.

[0062] The continuous wall portion 1731, 1831 protrude from the fixing plate 1735, 1835 outward, and the grip ring 1727, 1827 are provided on their edge portion. The continuous wall portion 1731, 1831 arrange the grip ring 1727, 1827 on their end portion apart from the outer side of the wheel 172, 182, and form the finger-holding cavity 1732, 1832 opening at inner periphery side, Further, the wheel 172, and 182 shown in these FIGS. also make their surface area of the continuous wall portion 1731, 1831 and fixing plate 1735, 1835 faces as non obstacle such as dips, projections nor gaps, those of which might bar operator's hand toward the rotation direction of the wheel 172, 182, as the above-mentioned wheels. It should be noted that, as for the continuous wall portion and the fixing plate, there might be minor objects or portions such as dips, projections or gaps to some extent that these objects would not hit nor hurt the hand even if the hand touched them.

[0063] The continuous wall portion 1731 shown in FIG. 17 makes its end portion curving toward the center of the wheel 172, same as the continuous wall portion 1631 shown in FIG. 16, making the finger-holding cavity 1732 deeper by such curving continuous wall portion 1731. In addition, the continuous wall portion 1831 shown in FIG. 18 forms angle of dip a as for the radial direction of the wheel 182 as an obtuse angle. Further, these continuous walls portion 1731, 1831 also defines the relationship of the maximum thickness (D) of the grip ring 1727, 1827 and minimum thickness (d) of the connecting portion 1735, 1835, such that the grip ring 1727, 1827 are easy to be griped.

[0064] The above-mentioned wheelchair is used as follows:

[0065] (1) The first bag case 4A and the second bag case 4B are opened, and the wheel 2 is taken out from the bag case 4.

[0066] (2) The elbow rest 6 is adjusted in desired length, and the first bag case 4A and the second bag case 4B are connected with substantially right angle.

[0067] (3) The axle 11 is fixed to the first bag case 4A, and the wheel 2 is mounted on this axle 11. After the axle 11 was inserted info the wheel 2, the stopper 14 is mounted on the nose of the axle 11 to prevent taking off. The stopper 14 has the locking part 14A for elasticity locking on the grip cavity 11A of the nose of the axle 11.

[0068] (4) The free wheel 3 retained in the first bag case 4A is raised from the first bag case 4A and stopped. Th footrest 9 is extracted and fixed.

[0069] In the above condition, the user or operator sits on the chair part 1, and rotate the wheel 2 to move back and forth. In case of folding the wheelchair, for example when taking a vehicle, the wheel 2 is detached, and retained in the bag case 4, the free wheel 3 is folded, and the footrest 9 is stored in the first bag case 4A. In this state, the first bag case 4A is connected with the second bag case 4B. This can move by moving caster 7 of the bag case 4. Also, telescopic motion handle 8 is extendable for movement by pushing or pulling.

[0070] The above-mentioned wheelchair according to the examples have foldable and movable structures that the wheelchair is foldable to be housed in the bag case 4, and carried easily. It should be noted that the present invention is directed to the unique wheel structure, not whole structure of the wheelchair. Therefore, construction of the whole wheelchair is not limited to the above-mentioned construction. For example, a wheelchair of the present invention can employ a construction shown in FIG. 19. The wheelchair shown in this FIG. comprises a chair part 191 having elbow rest 196 on both sides, a pair of wheels 192 rotatably attached on both sides of the rear area of the chair part 191, and a pair of free wheels 193 rotatably attached on both sides of the front area of the chair part 191 for changing the direction of travel freely. As shown in the condition of FIG. 19 to FIG. 20, the chair part 191 is foldable to make its width smaller or narrower by bring both elbow rest 196 near each other. This chair part 191 comprises side frame 1915 located on both sides, sitting base 1916 for sitting thereon, and folding link 1917 connecting the side frame 1915 and sitting base 1916 to be foldable. As shown in FIG. 19, the chair part 191 with this structure can establish a state in which a user can sit on the sitting base 1916 by wide opening the side frame 1915 each other. Also, folding state shown in FIG. 20 is established by closing the side frame 1915 each other, i.e., approaching the elbow rest 196 provided on the side frame 1915 near. In this folded state, this wheelchair is usable as a stick for moving.

[0071] Further, the chair part 191 shown in FIGS. fixes perpendicular pole 1918 in standing position, provided on the back of the side frame 1915. The perpendicular pole 1918 is extendable rod and it attaches grip 1919 on the upper end. The extendable perpendicular pole 1918 comprises fixed rod 1918A, telescopic motion rod 1918B which the fixed rod 1918A is inserted thereinto in extendable manner, and stopper (not illustrated in FIGS.) that can stop in a extended position. The stopper has a structure able to stop the telescopic motion rod 1918B in a predetermined position. The grip 1919 is attached to be projecting in the horizontal direction from the upper end of perpendicular pole 1918. Further, as shown in FIG. 21 with an arrow, the grip 1919 is rotatable within the horizontal plane, from the position projecting forward to another position projecting backward, rotating 180 degrees. This wheelchair is usable like a stick to support the operator's body stably in a state which the grip 1919 projecting forward by locating the grip 1919 in forward to the axle of the wheel 192 and backward to free wheel 193. Further, as shown in FIG. 21, In the state that the grip 1919 is rotated 180 degrees to projecting backward, an user site on this wheelchair and his caregiver such as his family can push it from behind easily to move forward.

[0072] The wheelchair shown in FIG. 19 to FIG. 21 have the foldable construction to reduce its width, and also construction of the extendable perpendicular pole 1918 provided behind of the chair par 191, and the grip 1919 attached on the upper end of the perpendicular pole 1918, which is rotatable 180 degrees. It should be noted, although not illustrated, the wheelchair may employ another structure, such as not foldable configuration, a configuration with not extendable perpendicular pole, or a configuration with not 180 degrees rotatable grip. Further, the wheelchair according to the present invention can employ any construction such as already developed and/or used, or future developed construction.

[0073] As this invention may be embodied in several forms without departing from the spirit of essential characteristics thereof, the present embodiment is therefore illustrative and not restrictive, since the scope of the invention is defined by the appended claims rather than by the description preceding them, and all changes that fall within metes and bounds of the claims, or equivalence of such metes and bounds thereof are therefore intended to be embraced by the claims.

[0074] This application is based on applications No. 2002-343026 filed in Japan on Nov. 26, 2002, and No. 2003-379091 filed in Japan on Nov. 7, 2003, the contents of which are incorporated hereinto by reference. 

What is claimed is:
 1. A wheelchair having a chair part (1) on which a user can sit, and wheels (2) provided on both sides in rotatable fashion by hand for moving, comprising: each of the wheel (2) having a rim member (20) forming outer periphery; a hub member (22) rotatably connected to the chair part (1) at the center of the rim member (2) via a wheel member (21); a cushion ring (26) fixed on the outer periphery of the rim member (20); continuous wall portion (31) on the outer side of the outer periphery; wherein the continuous wall portion (31) is formed in ring shape along the rim (20), and provides a grip ring (27) on the edge portion, and wherein a finger-holding cavity (32) is formed by the continuous wall portion (31), the finger-holding cavity (32) being capable for insertion of user's finger inside to rotate the wheel (2) by gripping the grip ring (27).
 2. A wheelchair recited in claim 1, wherein the rim member (20) of the wheel (2) is formed in U-shaped in cross-sectional form cut in the radial direction, in which an inner sidewall (23) positioned on the chair part side and an outer sidewall (24) on the opposing side are connected by a connecting ring (26), and the outer sidewall (24) forms the continuous wall portion (31), and the cushion ring (25) is fixed on the outer side periphery surface of the connecting ring (25), the inner sidewall (23) is connected to the wheel part (21), the grip ring (27) is provided on the edge portion of the outer sidewall (24), and a U-shaped portion (28) comprising the inner sidewall (23), the connecting ring (25) and the outer sidewall (24) forms the the finger-holding cavity (32).
 3. A wheelchair recited in claim 2, wherein the inner surface of the U-shaped portion (28) comprising the inner sidewall (23), the connecting ring (25) and the outer sidewall (24) is made an surface condition without irregularity which might interfere with user's hand in the rotating direction.
 4. A wheelchair recited in claim 3, wherein a smooth plate (29) is integrally formed on inner surface of the U-shaped portion (28).
 5. A wheelchair recited in claim 4, wherein the rim member (20) comprising the inner sidewall (23), the outer sidewall (24), the connecting ring (25) and the smooth plate (29) is integrally formed by plastic.
 6. A wheelchair recited in claim 1, wherein the rim member (20) of the wheel (2) comprises a ring member (30) fixing the cushion ring (26) on the outer periphery surface, and the continuous wall portion (31) provided on the outer surface of the ring member (30), and wherein the finger-holding cavity (32) is formed by the continuous wall portion (31) and the ring member (30).
 7. A wheelchair recited in claim 6, wherein the outer surface of the ring member (30) and the surface of the continuous wall portion (31) are made a surface condition without irregularity which might interfere with user's hand in the rotating direction.
 8. A wheelchair recited in claim 6, wherein the ring member (30) and the continuous wall portion (31) are integrally formed by plastic.
 9. A wheelchair recited in claim 1, wherein the continuous wall portion (31) is either curved or angled toward the center portion of the wheel (2), and the grip ring (27) on the edge portion is positioned on the center side from the outer periphery edge of the rim member (20).
 10. A wheelchair recited in claim 1, wherein the continuous wall portion (31) makes the maximum thickness (D) of the grip ring (27) larger than the minimum thickness (d) of the connecting portion (33) between the outer periphery of the wheel (2) and grip ring (27).
 11. A wheelchair recited in claim 1, wherein the rim member (20) except the cushion ring (26), the wheel member (21) and the hub member (22) are integrally formed by plastic.
 12. A wheelchair recited in claim 1, wherein the cushion ring (26) is a rubber ring.
 13. A wheelchair recited in claim 1, wherein the wheel member (21) is curved from inside to outside, toward the hub member (22) from the rim member (20). 